Arsenal coach Arsene Wegner says he has more than likely played against many teams whose players were on performance enhancing drugs.
Speaking to French newspaper L'Equipe, Wegner said that he suspects many players in world football use performance enhancing drugs and that more must be done to combat the problem.
"I try to be faithful to the values that I believe to be important in life and to pass them on to others,” Wenger told L’Equipe.
“In 30 years as a manager I’ve never had my players injected to make them better. I never gave them any product that would help enhance their performance.
"I’m proud of that. I’ve played against many teams that weren’t in that frame of mind.
“For me, the beauty of sport is that everyone wants to win, but there will only be one winner. We have reached an era in which we glorify the winner, without looking at the means or the method.
"And 10 years later we realise the guy was a cheat. And during that time, the one that came second suffered. He didn’t get recognition. And, with all that’s been said about them, they can be very unhappy.
"Honestly, I don’t think we do enough (on doping tests).
“It is very difficult for me to believe that you have 740 players at the World Cup and you come out with zero problems.
"Mathematically, that happens every time. But statistically, even for social drugs, it looks like we would do better to go deeper.
“I hope England is immune from doping but I don’t know. When you have a doping control at UEFA (matches), they do not take blood, they take only urine.
"I have asked many times in Geneva (for that to be changed). I hope we do not have a big problem with doping but we have to try to find out.”